# Relationship history for MSHA mine 4604155

Current hierarchy: **Monk Bill → Monk Mining Corp → No 1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Wyoming Coal Mining Company → No 1; 1950-01-01 to 1977-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Carroll Preston W → No 1; 1950-01-01 to 1977-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Carroll Preston W → Wyoming Coal Mining Company; 1950-01-01 to 1977-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Click & Leffew Coal Company Inc → No 1; 1977-01-06 to 1986-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Click Cecil & Larry M Leffew → No 1; 1977-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Click Cecil & Larry M Leffew → Click & Leffew Coal Company Inc; 1977-01-06 to 1986-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Monk Mining Corp → No 1; 1986-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Monk Bill → No 1; 1986-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monk Bill → Monk Mining Corp; 1986-06-16 to current/open; source msha-controller-operator-history